النتائج (
العربية) 1:
[نسخ]نسخ!
How can we make cleaner engines?Energy density of petroleum fuels, wood, and batteries compared on a bar chart.There's no doubt that Otto's gasoline engine was an invention of genius—but it's now a victim of its own success. With around a billion cars on the planet, the pollution produced by vehicles is a serious—and still growing—problem. The carbon dioxide released when fuels are burned is also a major cause of global warming. The solution could be electric cars that get their energy from cleaner sources of power or hybrid cars that use a combination of electricity and gasoline power.
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